This feature is based on Cloudflare Spectrum, which not available for free plans. But we have another way to get it.

That is Plesk/ServerShield by Cloudflare. We can get it from some hosting provider at a low price, even for FREE.

Then follow the steps bellow:

1. Add your domain in ServerShield to cloudflare,

2. Login the Cloudflare Dashboard, enter your domain zone

3. Click Spectrum in the navigation bar

4. Click "Creat an Application", choose SSH, enter the domain name (for example: ssh.example.com) and IPv6 address, then save it

5. If your nameserver is Cloudflare, then just ssh to you domain name (for example: ssh.example.com). Otherwise create an CNAME record to ssh.example.com.cdn.cloudflare.net

btw: using spectrum can also reduce latency and increase stability

Over~~  lol